Control system bidding issues

I don’t know how big the scope of your tender is? If it is just an upper-level control system, it is necessary to know clearly what functions the system is to implement, detailed information about on-site equipment, the responsibilities of both parties, how to hand over and accept, what documents to hand over, what standards to follow, etc.

The number of points required, the functions required, the functions the system can provide, the system's proven application performance in similar devices, the reliability and robustness of the system, and finally the price.

Let the manufacturer ensure the integrity of the system, software licensing points, etc.

Including technical bids and commercial bids, the proportions vary according to requirements, and the rules are formulated by yourself. Provide supervision plans to the factory in advance so that the plans provided by bidders can meet the basic requirements ； Provide similar process performance and go to companies that have already used the control system to examine the application effects. ； If you have authorized points, you must have enough margin. ； Some do not provide software, so if you want to increase your points, you have to find them all, which is very frustrating. * get used to their ways.

There are many issues to pay attention to during the bidding process, and the technical bid is the most critical. Below I attach a system configuration file that was given by the manufacturer of our bidding documents at that time. You can carefully check the technical requirements of your project. I think the basic requirements are all there. 3． System Configuration and Function Description 3.1 System Configuration Description This bidding system uses XXXX's comprehensive production control system The XXX system consists of three parts: human-machine interface unit (engineer station, operation station), on-site control station and communication network. For details of the system structure, see the "System Configuration Diagram". According to the requirements of the system technical specifications, this project is equipped with XX dual redundant control stations and XX engineer/operator stations. The specific configuration is as follows: The human-machine interface system configuration provides XX engineer stations and operator stations, and XX operator stations. Centralized monitoring of the entire project. The engineering station is mainly used for system management, configuration maintenance and modification, and can also be used as an operator station. The human-machine interface station operating system is: XXXX. The system database capacity is XXXXX work station numbers. We choose XXX workstation as the engineering station and operation station, and the configuration is as follows: XXXXXXXXX. The operation station and engineers are equipped with special XXX communication cards, produced by XXX and originating from XXX. The control station is equipped with a dual redundant field controller according to the technical specifications. Control FCS is a highly reliable and high-performance dual field control station, model: XX, the memory is XXM, has XX CPU redundant fault tolerance, dual power cards, the power cards on both sides are connected to the mains power and UPS power supply, and work at the same time. If one power supply is broken, it will not affect the system control. Dual, communication rate is XXMB/s, the selected control station has passed CE certification. The 4-20mA analog I/O card is an XX point isolation card. The RTD input card is an XX point isolation card, the TC input card is an XX point isolation card, and the digital I/O card is an XX point isolation card. All input and output cards are equipped with dedicated terminal boards. The digital quantity card is equipped with a special relay terminal board to facilitate on-site wiring. Communication cables and connection accessories are provided with DCS. For details on the configuration of the I/O card, see the "I/O Configuration List". The accuracy of the input and output cards is not less than X, and the resolution is not less than X. The output conversion accuracy is no less than XX, and the resolution is no less than XX. The control station of this system is configured strictly according to actual needs. There is XX spare capacity for input and output cards, and XX installation space is reserved for each cabinet. When the control station is fully loaded, the system's power supply, software, communication load and other various loads have a working margin of more than XX. The load of the control station does not exceed XX. Please see the appendix for the load calculation of the control station.: Control station load calculation. Various I/O cards and XX controllers are produced by XX and originate from XX. Software configuration This system configuration provides a complete program software package that meets the requirements, including real-time operating system, applications, etc. The capacity of the software is based on the maximum configuration of the device. Please see the software configuration: Software manifest. The engineering station provides standard graphic configuration methods. All configuration is performed in a graphical environment. Design and configuration work can be carried out simultaneously, simplifying the work process. Rich user-defined macro functions make configuration easier and more efficient, and configuration files are printed out graphically. Configuration files can be modified and downloaded online without stopping the CPU of the control station. Software debugging can be performed using the testing function of the engineering station to reduce engineering costs. The engineering station is set with a software protection password to prevent ordinary personnel from changing the control scheme, application program and system database without authorization. All control algorithms and system parameters reside in the memory and do not need to be reloaded during execution. Common programming languages ​​such as XX, XX, and XX can be provided to meet the needs of user engineers in developing application software. The printer is equipped with a printer for report printing (A3 specification), which can be used to print graphic information and reports on the CRT screen. The printer can meet the needs of the operation station for screen graphics printing and offline printing. Please see the "Hardware Equipment List" for the specific model of the printer. The disk cabinet is equipped with X cabinets, including control cabinets, terminal board cabinets, and power supply cabinets. The cabinets are equipped with dual power supplies for redundancy. Various types of cabinets leave X amount of spare installation space. The communication network system is equipped with real-time data network XX. XX network uses XX transmission protocol with a rate of Xbps. The system communication bus load does not exceed XX. See the attachment for network load calculation. Internal XX bus communication rate XXbps. XXXXX XX communication is available online. The communication system with peripheral equipment is equipped with The system provides an XX interface, which can provide the required data for the upper management system. Power supply The power supply specifications used by this device are single-phase 220VAC, 50Hz uninterruptible power supply (UPS). Please see the appendix for the power supply specifications, operating current, maximum starting current, power supply equipment protection current specifications, power consumption and heating value of various DCS equipment. System grounding complies with relevant standards and specifications such as IEC1024-1, IEC354-5-548-1996, ISA-RP12.6-1995, IEC60079-14-1996. The ground resistance is less than XX ohms. See the system grounding map in the appendix for details. 3.2 System technical function description 3.2.1 Overview This technical agreement describes the technical documents of the advanced, latest, scalable, scalable and highest-reliability automatic control system XX provided by XXXX Company based on the specific conditions of the "XX Company XX Project DCS System Technical Specifications". This system is a mature system that has been tested in practical applications and can meet the needs of process control, detection, optimization and management of large-scale production of petrochemical equipment. XX fully meets the safety needs of petrochemical enterprises. XX has passed ISO9001 quality system certification. All DCS equipment provided in this project have passed CE certification, and has extensive performance in projects of the same scale in the domestic petrochemical industry (see the attachment for details). 3.2.2 Process control and detection 3.2.2.1 The control station (XX) with control function XX can meet the function and speed requirements of conventional process control of petrochemical equipment, and has the functions of continuous process control, batch control, sequence control and high-level programming language (which can perform data calculation and data conversion). In terms of control, the system can complete regulatory control, interlocking logic, manual operation, and automatic sequences composed of standard algorithms or user programs. The interlock control function can be used for Boolean logic for regulating control and ladder logic for switch control. The sequence control function executes a start/stop sequence or any predefined program steps. Users can easily define multiple processing speeds of the controller and run continuous control and interlocking logic control at different speeds. The controller adopts an exclusive 4-CPU redundancy technology. There are two independent CPU units in the left and right CPU modules. The four CPU units operate simultaneously. Each side compares the operation results of the two independent CPU units for consistency. If the comparison results are consistent, the controller on that side outputs the operation results. This effectively diagnoses any hardware failures or random computing errors. Prevent any error output and ensure uninterrupted output of correct control operation results. It achieves error correction and continuous uninterrupted control in the event of any faults and random errors. The controller can have online programming and modification capabilities without interrupting the running program or switching control to the backup processor. New control function blocks can be inserted anywhere in the running program and transmitted to all operators on the highway within XX seconds. The controller has fast control capabilities. The cumulative time from I/O input through PID control calculation to AO output does not exceed XX seconds. The CPU hardware adopts the XX processor of XX company. The XX processor mainly constitutes a central processing CPU unit with dual pipeline operation and XXMB error correction memory. It can perform XX-bit floating point operations and support XX-bit instrument tag number. It has powerful control calculation functions. It has PID parameter self-tuning function and also has the following control software functions: Temperature and pressure compensation for gas and water vapor flow measurement ； XX control ； XX control ； Other process control software ； The processor module with fault-tolerant redundant configuration adopts a dual bidirectional cross-coupled parallel communication interface structure, that is, the communication interface between the control unit and the remote I/O is 1: 1Redundancy fully ensures the reliability of data transmission. The remote I/O bus (XX) realizes the decentralization of I/O and controller processing functions, further improving the reliability of the system. The control cycles of each control and interlocking logic control loop can be selected according to different needs. The scan cycles are respectively: Basic XX ms ； High speed XX ms XX ms XXms XXms. To communicate with subsystems, the XX system provides a wealth of cards and special software for communicating with third systems (PLC, ESD, gas chromatography analyzer and other subsystems). Through network integration, a comprehensive control network system for factory production can be constructed. With the support of these software and hardware, XX can read and write the process data of the subsystem in a centralized manner just like the station (XXXX) of this system. The entire process is realized without any language programming, only through simple and easy filling in the form (XX) or drawing (CONTROL) DRAWING) mode can realize the setting and access of subsystem data. The system has a complete self-diagnosis function and can diagnose faults down to the module level. Diagnose controller faults, communication network faults, input/output signal abnormalities, I/O module faults, illegal input instructions, redundant backup, etc., and automatically prompt detailed fault information. All modules of the control station can be configured redundantly. The cards in a redundant configuration actually work at the same time. Only the card on the working side outputs the results and the card on the standby side does not. When the working side fails, the results from the standby side are output immediately, thus achieving seamless switching. In addition, since the card on the spare side is also working, the system can detect its status at any time. 3.2.2.2 The data acquisition function XX control station can meet the needs of all process variable detection. The system can provide linearization, compensation, accumulation, square root and alarm functions for analog quantities. ； The system can provide alarm and status change detection for switch values. The system can store various process parameters, detection signals, operating processes, and alarm event data in the hard disk as needed, and can call them at will. This system has a trend recording function and can provide XX trend XX points. 3.2.2.3 Process I/O interface In addition to the commonly used types of I/O interfaces in this project, we are also equipped with a standard XX communication interface (XX). The accuracy of all types of cards meets the requirement of 0.1%. And the I/O card has the function of identifying open circuit or short circuit in field wiring and issuing an alarm. The output signal card keeps the output unchanged or reaches the preset safe output value when the equipment fails. The I/O card used for thermocouple temperature detection has the function of cold junction temperature compensation. XX's process controller can support various input and output signals from field devices, and all input and output circuits can prevent signal overloads, transients and surge impacts. The analog I/O module's ability to withstand impulse voltage is 1XXVAC/1 minute, and the switching I/O relay module's ability to withstand impulse voltage is XXVAC/1 minute, which complies with the requirements of ANSI/IEEE472 "Impact Voltage Withstand Test Guidelines (SWC)". The control output I/O module adopts a 1:1 redundant high-reliability configuration. The module used for signal control and monitoring adopts 16-point multi-channel card. All I/O modules are intelligent cards equipped with 8MHz high-speed microprocessor (μP) and A/D, D/A converters. At the I/O card level, they can perform functions such as I/O processing, digital filtering, industrial range conversion, linear operation, thermocouple cold junction compensation, I/O open circuit inspection, fault diagnosis and other functions. The temperature detection point can be directly connected to the DCS system. Each thermal resistance card has an independent bridge circuit, and the input/output channels are isolated from each other. Under normal operating ambient temperature, the measurement accuracy can be completely guaranteed, and there is no need to make periodic adjustments to its zero drift and gain. The thermocouple card has the function of cold end temperature compensation. In order to ensure that when the power supply of the control system fails, the process system is in a safe state and does not malfunction, the pulse width control method can be used according to the situation, or the actuator can be set to maintain the position before power loss. Anti-interference ability: Common mode rejection ratio>XX Differential mode rejection ratio>XX Common mode voltage≥XX Differential mode voltage≥XX 3.2.2.4 Redundancy All function cards in this system can be configured in 1:1 redundancy mode. All kinds of cards are allowed to be plugged in, removed and replaced while powered on. 3.2.3 Operating environment and human-machine interface 3.2.3.1 Operation station The operation station is the human-machine interface for operators to monitor, control the production process, maintain equipment and handle accidents. Its hardware and software have high reliability and fault tolerance, and the software has the function of quickly recovering from errors. 3.2.3.2 As the host of the operation station, we choose XX high-performance industrial computer that has been tested and recommended by Yokogawa Corporation and adopts the universal XX operating system. Operators can monitor and operate the production process parameters, equipment status and control system online through the operator station. The hardware specifications of the operation station are XX-bit bus, XX-bit CPU, level 2 cache (Cache), and SCSI peripheral controller. The operator station has a hard drive and can be configured for redundancy, allowing the host to self-start independently. And configure the CD-ROM drive. All peripherals and interfaces of the operation station are universal. Hard drives, floppy disk drives, monitors, universal keyboards, mice, printers, etc. are all commercially interchangeable. Each operating station/engineering station has an independent CPU. The processor or power failure of one operating station/engineering station will not affect the operation of other operating stations. The operator can access process variables and graphics from any operating station in the system. If one operating station fails, any other operating station can be used to replace it. 3.2.3.3 Software of the operating station The software operating environment of the operating station can adapt to the operational needs of process control of large petrochemical plants. It can access and call process flow charts, trend charts, process parameters, data records, alarm processing and various available data according to the operator's permissions, and can effectively adjust the output and setting parameters of the control loop. Data resources on the network can be divided into different operating areas or data collections, and different operations such as monitoring and control can be performed as needed. The operation station has different levels of operation rights and operation rights for different operating areas or data collections. Operation levels and permissions are password-limited. The operator password and operation permissions should be set and modified by the system administrator. The operation station has the ability to manage and maintain on-site intelligent instruments (Hart protocol) 3.2.3.4 Data processing capability: Each operator station has an independent host and a redundant data communication bus. All operator stations have the same configuration and run in parallel as backup for each other. They can divide labor to complete different display and control functions, or complete the same display and control functions. The data storage format of the operation station is universal, and the database and database management system are standard and commercialized, and can be called by other authorized workstations and PCs on the network. Permanent records on the hard disk can be transferred to a tape drive or removable hard disk. 3.2.3.5 The alarm window of the alarm function can be directly called up through the operator's keyboard, displaying the station number, comments, alarm value, alarm type, alarm time and current process value, and can be quickly switched to the corresponding operation screen for processing. Each page has XX alarm information, and can retain XX current real-time alarm points. The alarm display is arranged in chronological order. The latest alarm appears at the top of the screen. When XX alarm points are exceeded, the oldest alarm disappears. Alarm confirmation can be done through the operator keyboard. After pressing the confirmation key, all alarms will be confirmed, and the confirmed alarms will no longer flash. (XX alarm history points, about XXMB). In the system alarm, the configuration of sound, color, etc. can be performed independently and online. It can be completed without downloading the controller. There are X different alarm levels for instrument alarms. Symbols and colors are used to distinguish the importance. When two alarms occur at the same time, the severe alarm will be given priority and the mild alarm will be suppressed. The alarm limits are respectively equipped with alarm dead zones. The "alarm blocking XX" can be manually set and released for any signal at the operator station. “The "alarm blocking" function only suppresses the emission of alarm information and does not affect data collection and calculation processing. 3.2.4 System management and project implementation The contents of system management include the management of system resident data, online diagnosis of system equipment, maintenance of system software data, system configuration and modification, graphics management, in addition to user applications, further processing of production process control data, file services, etc. Project implementation mainly includes system and equipment configuration, debugging, modification, testing, loading, establishment of configuration database, etc. System management and project implementation are mainly performed by the engineering station, and some work can also be performed at the operation station. 3.2.5 System reliability and availability 3.2.5.1 Reliability of the system: Reliability data of all equipment, mean time between failures (MTBF) and mean time to repair (MTTR) of the system and their calculation methods, see the appendix: System reliability data calculation 3.2.5.2 System availability: Various plug-in cards in the XX system can be plugged in, removed and replaced online. Redundant equipment can perform online self-diagnosis, troubleshoot and alarm, and automatically switch without errors. The system has complete hardware and software fault diagnosis and self-diagnosis functions, and the diagnosis system is automatically or manually started at a scheduled time, automatically records fault alarms, and can display the self-diagnosis status and results on the operating station/engineer station display to prompt maintenance personnel to perform maintenance. The self-diagnosis system includes comprehensive offline and online diagnostic software. The diagnostic program can check system equipment faults and check the operating status of external equipment. The XX system has strong fault tolerance, that is, when some modules fail, the effective work of the entire system will not be affected. 3.2.6 Communication network The communication network is divided into production process control network and factory management network. 3.2.6.1 Production process control network (1) XXXX: Dual real-time control network for data exchange between stations. Communication method: Read/write communication, information communication, link transmission, comply with XX standard communication rate: Maximum XXbps communication distance: Maximum XX transmission media: XX attenuation gain: XX connector: Number of connectable stations: XX encoding method: XX verification method: XX (2) bus: Used for process data transmission between the central main controller FCU and local I/O nodes in the control station. Network method: Bus type communication speed: XX XX node: XX communication distance: Maximum 10m (3) bus: Used to control data transmission between local I/O nodes and remote I/O nodes in the station. Network method: Bus type communication speed: XX XX node: XX communication distance: Maximum 2KM 3.2.6.2 Network connection The production process control network can be connected to the factory management network. The communication method is XX. This system provides XX communication port, and XXXXXX functions can be performed on the Ethernet network. 3.3 Hardware Configuration Description All hardware configurations of the system are configured in strict accordance with the "XX Project DCS Technical Specifications" provided by XX Company. For detailed hardware configuration, see: System configuration instructions, hardware equipment list. 3.4 Software configuration description The DCS of this project is equipped with a full set of process control software, process detection software and operation software. The capacity of the software is configured according to the maximum configuration of the equipment. , the system comes with PID parameter self-tuning function. For details on the various software used in this project, see: Software equipment list

1. Check the requirements on your purchase list one by one to see if the conditions are met. 2. Whether the bidder’s qualifications are qualified. 3. The bidder’s performance in the field. 4. After-sales commitments and quality assurance. 5. On the basis of meeting the above conditions, compare prices.